Gang’s 82-story Aqua Tower, 225 North Columbus Drive, opened in 2009 to international acclaim. Its organically rippled balconies suggest the movement of wind across water. The undulating balconies are functional, too, providing sun shading and eliminating the need for a tuned mass damper.

Design details for the new tower are forthcoming, but the developers said it could work on either of two sites in the Lakeshore East area.